<template>
  <a-upload
      v-model:file-list="fileList"
      name="avatar"
      list-type="picture-card"
      class="avatar-uploader"
      :show-upload-list="false"
      action="https://www.mocky.io/v2/5cc8019d300000980a055e76"
      :before-upload="beforeUpload"
      @change="handleChange"
  >
    <img v-if="imageUrl" :src="imageUrl" alt="avatar"/>
    <div v-else>
      <loading-outlined v-if="loading"></loading-outlined>
      <plus-outlined v-else></plus-outlined>
      <div class="ant-upload-text">Upload</div>
    </div>
  </a-upload>
</template>
<script>
import {PlusOutlined, LoadingOutlined} from '@ant-design/icons-vue';
import {message} from 'ant-design-vue';
import {computed, defineComponent, ref} from 'vue';

import store from "@/store";

function getBase64(img, callback) {
  const reader = new FileReader();
  reader.addEventListener('load', () => callback(reader.result));
  reader.readAsDataURL(img);
}

export default defineComponent({

  name: 'photoUpload',
  components: {
    LoadingOutlined,
    PlusOutlined,
  },

  setup() {
    const user = computed(() => store.state.user);
    const fileList = ref([]);
    const loading = ref(false);
    const imageUrl = ref('');
    imageUrl.value = user.value.photo;

    const handleChange = info => {
      if (info.file.status === 'uploading') {
        loading.value = true;
        return;
      }

      if (info.file.status === 'done') {
        // Get this url from response in real world.
        getBase64(info.file.originFileObj, base64Url => {
          imageUrl.value = base64Url;
          loading.value = false;
        });
      }

      if (info.file.status === 'error') {
        loading.value = false;
        message.error('upload error');
      }
    };

    const beforeUpload = file => {
      const isJpgOrPng = file.type === 'image/jpeg' || file.type === 'image/png';

      if (!isJpgOrPng) {
        message.error('You can only upload JPG file!');
      }

      const isLt2M = file.size / 1024 / 1024 < 2;

      if (!isLt2M) {
        message.error('Image must smaller than 2MB!');
      }

      return isJpgOrPng && isLt2M;
    };

    return {
      fileList,
      loading,
      imageUrl,
      handleChange,
      beforeUpload,
    };
  },

});
</script>
<style>
.avatar-uploader > .ant-upload {
  width: 128px;
  height: 128px;
}

.ant-upload-select-picture-card i {
  font-size: 32px;
  color: #999;
}

.ant-upload-select-picture-card .ant-upload-text {
  margin-top: 8px;
  color: #666;
}
</style>